Roughly 39 km-wide field of view as context for the more detailed view of erosion and floor fractures on the northwest floor of Humboldt crater (199 km, 27.02°S, 80.96°E). Red rectangle outlines field of view swept up in LROC NAC M146466012RE and the yellow box designates the area withing the LROC Featured Image released December 23, 2013, LROC monochrome (604 nm) Wide Angle Camera (WAC) observation M161787569CE, LRO orbit 8976, November 6, 2011; angle of incidence 70.87° at 67.16 meters per pixel resolution from 47.6 km [NASA/GSFC/Arizona State University].

Further context of western Humboldt crater, a 103 km-wide area, from a stitching together of three LROC WAC observations, including LROC WAC observations swept up in orbits immediately before and after on November 6, 2011. View the full-sized original mosaic HERE. [NASA/GSFC/Arizona State University].

The lava flows, some of which can be seen in the WAC context images above, are limited to only a few small areas within Humboldt and only partially fill some fractures, so they were probably not extruded during the formation of the fractures. If they had been emplaced during the formation of the fractures, then we would expect to see lava flows everywhere there are fractures, which is not the case. However, the intrusion of the magma into the subsurface of the crater floor (that eventually erupted onto the surface) could have contributed to the formation of the fractures by causing the floor to dome up.